These are Brass Bushes.\r\nThese are male brass bushes.\r\nMale brass bushes are used to screw into conduit boxes.\r\nWhen used it allows you to attach more conduit easily will out a problem.\r\nIt also helps to seal the gap so the joining still looks neat.\r\nBrass bushes also a allow for a easy removal as brass allows for little friction which allows access.\r\nConduit boxes are used for cable management.\r\nConduit boxes allow you to neatly tuck away wires without a lot of hassle.\r\nWith the use of conduit boxes you can ensure your wires are still accessible even when used with conduit tubes.\r\nThese 20mm brass bushes are included in our one year guarantee, as are all of our products on our website electricals247.co.uk.